Watch This: Ronnie James Dio in 'Metal: A Headbanger's Journey'

In honor of the passing of Ronnie James Dio, the heavy metal singer who is most famous for his work in Elf, Rainbow, Black Sabbath, Dio, and Heaven and Hell, here are several clips from the excellent documentary, Metal: A Headbanger's Journey. In the doc, directors Sam Dunn, Scot McFadyen, and Jessica Joy Wise traveled the world to interview the legends of heavy metal, not just as lifelong 'bangers but with an eye towards its musical family tree, thematic elements, battles with censorship, and much more. Dunn's academic background as an anthropologist makes Metal much more than a fanboy's tribute. (For a true fanboy tribute, check out Tenacious D's song "Dio.")

Although outsiders might have poked fun at Ronnie James Dio's theatrics, his stunning range, or his predilection for fantasy novel swords-and-dragons imagery, metal fans remain loyal to the man who brought us songs like "Heaven and Hell" from the Black Sabbath album of the same name, "Rainbow in the Dark," and "The Last in Line." (True fans will note he started as a doo-wop singer with The Prophets.)

Dunn and McFadyen interviewed Dio twice for the documentary, specifically about his religious views since so much of his imagery is about, well, heaven and hell. He's also often attributed with the hand gesture most associated with heavy metal -- throwing the devil horns. In these two clips, he discusses how he learned the gesture from his grandmother, his Catholic upbringing, and why religious imagery shows up so often in his music. (You also get a sneak peek into the late musician's house.)